I'd recommend the sample projects from google & just having a muck around. Learning the debugger in eclipse is also a very useful tool for understanding what's going on.

?? Could you elaborate a little more? Thanks.

EDIT: OK, I now noticed you were replying to a sub-comment and not the main thread (missed that earlier). Still, a link or two be helpful in directing the rest of us to the 'source'.

I jumped head first into Android and learned both Java and Android at the same time. It's doable, if you know something like C or C++ already.

Programr has some things for Android: http://www.programr.com/zone/android